Internet Authentication Service WLAN Server

I just picked up a Linksys WAP54G Wirelss Access Point and I am now trying to setup a security for WPA-Enterprise.  I installed Internet Authentication Service on my 2003 Server which already had Certificate Authority installed.

I have followed this guide: http://www.hansenonline.net/Networking/wlanradius.html but it does not seem to be working.

At one point it was stuck at validating identity and another it was telling me their was a cert error about unable to log on to network [ssid].  Can someone please walk me through this step by step or give me another article to try.

thanks.